*{
    margin: 0;
    padding: 0;
    font-family: 微软雅黑,sans-serif;
}
ul li{
    list-style: none;
}
a{
    text-decoration: none;
    color: #000;
}
.w{
    width: 1200px;
    margin: 0 auto;
    overflow: hidden;
}

.left{
    float: left;
}
.right{
    float: right;
}